V2Ray is a set of tools for building proxies to bypass network restrictions and access blocked websites.
Vmess is a protocol that is used to connect to the v2ray server.
OneClick is an app that is used to connect to the v2ray server, A free app for iOS devices.
Open the App Store on your iOS device.
Search for OneClick and install it.
ON the next screen, you can see the connection status and the location of the server.
You can also add more servers to the app. just repeat the steps 3 to 5.
For more information about the OneClick app, you can visit the official website of the app.